Motor-control system.



J. H. HALL.

MOTOR GONTROL SYSTEM.

APPLIOATION FILED SEPT. 5, 1913.

1,122,743, I Patented Dec. 29, 1914.

JAY H. HALL MANUFACTUP i IIJZZXQE,

To all Le/10m, it may co /1c Be it known that zen of the United land, inthe county of of Ohio, have in; L provenients in Motor which thefollowing is a My invention re for electric motors a in which the motorcir the contacts of an open; automatically controlledmagnetically-operated swi ticularly, it relates to operating windingsoperated switches rent in the motor CliCUim One of the objects oilcontrol at will the ari on ance of the motor circuitwith the automaticremoval of t. by means of the inagnetiov switches.

A further object of my inn enable the ope *ator to cause the open andinsertthe resist-awe circuit without noducing the switch contacts.

Other objects and advant of control systein' will be scribed.

In tl e accompanying drawings, is a diagrammatic representatio ing thesystem of my inventio a modification showing another invention.

The resistances for controlling the motor circuit are indicated at R Rano resistances are arranged to be autoinitically controlled by theswitches S, 3-, and having operating windings C Q3. an; ar angled to beconnected in the motor c cuit. I prefer to use for these type of switchdisclosed in liastmoods Pa ent, No. 1,040,292, which remains open whenthe current in its winding is above a predetermined value, and operatesto close its contacts when the current is reduced. operators switch,shown at M, in T at N in Fig. 2, has stationery and inovaile contacts bywhich the operator Vary will the motor circuit connections.

' thron -h any of i c or J-l t. oin Lie moi-oi cn. it tor maintains theswit h in other words;- as p nains in position 1 to .i v

' tor 61"Cl1lil will rcinai c tr t nuoger 4 s the 4 contact i L windingC of the switch 5 ice armature i l" and R the motor d i to the ne itclose its contacts. 'lhiswill not cause further resistance to be cut outuntil the o} ator moves the switch to position fi'itn the operatofisswitch in position 3, the resistance R is cut out and the windin of theswitch S is energized. the sw S and S remaining closed. The sw remainsopen until the current diir below the value at which this switchadjustedto or ate whereupon it will close its contacts. hen the switch more toposition a resistance it will he on out and the riotor will then operatea maximum speed. The motor circuit at time will oe as follows: From posit its this ti re lcr contacts, the contact finger 11, the winding 0',the contacts 01": the switch S, the contact finger 10, the controllercontacts, the contact finger 9, the winding the contacts of the switch Sthe contact finger S, the controller contacts, the contact finger 7, thewinding C the contact finger 5, the contacts oi the controller, thecontact finger 6, the contacts of the switch S the motor armature A, andthe field F to the negative. in moving the operators switch M backtoward the off position the contacp at the successive steps open thecircuit through the contacts of the switches S S and S, respectively,before the windings of the said switches are deenergized and the saidswitches are opened, wherefore the said switches drop open, at a timewhen no current flows through their contacts, thus preventing any arcingat the same. If the operators switch is moved from the off positionimmediately to position 4:, the switches S, S and S will close inautomatic progression to cut out the starting resistance, each switch inclosing energizing the winding of the succeeding switch and each switchremaining open until the current in the motor circuit has diminished toa predetermined value.

In Fig. 2 the starting resistances R, R for parallel connection and Rare arranged instead of tlie series connection of Fig. 1 When theoperators switch N is moved to position 1, the motor circuit is asfollows: From the positive through the contact finger 18, the controllercontacts, the contact finger 17, the winding motor armature A, and thefield F to the negative. lhis is the position of maximum resistance and.as long as the operators switch remains in position 1 the motor operatesat its slowest speed. If the motor current exceeds the predetermined.value, the switch S3 remains open. It closes its contacts when the motorcurrent is reduced to the said value. When the operator wishes toincrease the speeed of the motor, the switch N is moved to the position2, whereupon the motor circuit is from the positive through t e contactfinger 18, and the controller contacts, the Contact fingers 137 and 16in parallel, one branch of the cir cuit being through the winding C andthe resistance R and the other liranch oeing through the contacts of theswitch S, the winding G and the resistance it" to the point where thebranches unite, the united circuit being thence through the armature Aand the field i to the negative. The switch S remains open until thecurrent in its winding has dimini shed to the value at which it isadiustcd to operate, thereupon the switch 5 closes. To increase thespeed of the motor 'i urther. the operators switch N is moved to PM. ionwhereupon a third branch of the circuit C, the resistance R, thomadethrough the contacts of the switch S, the windings C and the resistanceR The th.ee branches of the motor circuit through the resistances R, Rand hi all carry current, deperding upon the values of the resistances.The switch S remains open until the current through its winding C isdiminished to the value at which it is ad- 'iusted to operate,

, whereupon it closes. lVhcn the operator moves the switch to positionall the resistance is cut out and the circuit is then from the positivethrough the contact finger 18, the controller contacts to the contactfinger ii, the contacts of the switch S, the motor armature A, and thefield F to the negative. The windings C, C and C will he deiii'iergizedand the switches S and S will drop to their open positions. T 0 maintainthe switch S closed, a holding winding (l provided which is energizedfrom the contact 13 on the operators switch. This holding winding is sodesigned that it will not cause the switch S to close but will hold itclosed after the switch has been closed lay its operating winding C Thespeed of the motor can be decreased by moving the operator's switch backto the intermediate positions 1, Z, and 3, or the motor can he stoppedby moving it to the oil position, as shown in the drawing. A seriesholding winding can be substituted for the shunt winding G on the switchS if desired. The series winding in such an arrangement may be connectedin the conductor 19 and would not become energized until the closure of:the switch S with the operatows switch in position 4. It will be noticedthat, in moving the operators switch from any of these positions to wardthe oii position, the circuits through the switch contacts are openedbefore the operating windings of these switches are deenergized so thatthere is no arcing at the switch contacts, and that the resistance isremoved "from the motor ircuit only when the current in the motorcircuit is below a predetermined value and that the operator can delaythe cutting out of the resistance at will.

It will he understood hy those skilled in the art that a revcrscr mayprovided for the motor if it is desired to reverse the motor. It willalso he obvious that other changes can be made in the apparatus withoutdeparting from the spirit of my invention.

1 claim-- 1] In a circuit-varying controller, a controlled circuit,resistances, a series or switches for cutting out the crating windingstherefor energized by current in the controlled circuit, and means fordei ncrgizing the said windings at will.

In a currentwairying controller, a controlled circuit, resistances, aseries 0 resistances, op-

switches for cutting out the resistances, op erating windings thereforenergized by current in the control circuit, and means for progressivelyenergizing and deenergizing the said windings at will,

3. In a current-varying controller, a controlled circuit, resistancestherefor, a series of switch contacts for the resistances, operatingwindings for the switch contacts adapted to be connected in thecontrolled circuit, sets of contacts corresponding to, and adapted to beput in series with, the said'switch contacts, and means for closing oneor more of the said sets of contacts at will. I

4. In a .current-varying controller, a controlled circuit, resistancestherefor, a series or" magneticallycperated switches for cut ting outthe resistances, operating windings therefor, and an operators switchcomprising contacts for consccutivel T connecting said switch windingsin the controlled circuit.

5. In a current-varying controller, a controlled circuit, resistancestherefor, a series of switches for automatically cutting ,out theresistances, operating windings therefor energized by current in thecontrolled 'circuit, and an operators switch for delaying the operationof the switches, comprising contacts for connecting the winding of thefirst switch in series with the resistance and for connecting thecontacts of the first switch in series with the winding of a secondswitch of the series.

6. In a current-varying controller, a con trolled circuit, resistancestherefor, a series of switches for automatically cutting out theresistances, operating windings therefor energized by current in thecontrolled circuit, and an operator s switch having contacts in thecontrolled circuit for connecting the contacts of each switch in acircuit irrcluding the winding of the next succeeding switch Y. in anelectric motor-control system, a motor, resistances, a series ofmagneticallyoperated switches having contacts for controlling theresistances, and an operators switch having contacts in series with theswitch contacts for progressively opening and closing the circuit atwill through the said switch contacts.

8. In an electric motor-control system, a motor, resistances, a seriesof magneticallyoperated. switches having contacts for controlling theresistances, and an operators switch having contacts in series with theswitch contacts for progressively opening the circuit through the saidswitch contacts.

9. In a motor-control system, a motor, a circuit therefor, a pluralityof resistances in the circuit, a series of switches for controlling theresistances, operating windings therefor energized by current throughthe motor, and an operators switch comprising contacts for connectingthe winding of the first switch in series with the resistances in themotor circuit and for shunting a portion of the resistances winding ofthe second switch in series with the winding of the first switch and there maining resistances. I

10. in a motor-control. system, a motor, a circuit therefor, a pluralityof resistances for the circuit, a series of switches for controlling theresistances, operating windings therefor energizcd by current in themotor circuit and a switch mechanism having contacts in the said circuitfor connecting the motor in circuit with maximum TQSlELQIlCQ, forpreventing automatic variation of the resistance by the switches, andfor permit ting the switches to cut out the resistance.

Signed at Cleveland, Ohio, this 2nd day of Sept, A. D. 1913. I

JAB. I

Viitnesses:

A. W. CLArrnnron, H. Ivli. DIEMER.

and connecting the

